diff --git a/include/cpp.h b/include/cpp.h
index 26c5301..e63cedf 100644
--- a/include/cpp.h
+++ b/include/cpp.h
@@ -119,8 +119,6 @@ void cpp_delete(Cpp * cpp);
 /* accessors */
 char const * cpp_get_filename(Cpp * cpp);
 
-int cpp_is_defined(Cpp * cpp, char const * name);
-
 /* useful */
 int cpp_define_add(Cpp * cpp, char const * name, char const * value);
 char const * cpp_define_get(Cpp * cpp, char const * name);
diff --git a/src/cpp.c b/src/cpp.c
index 21f8f66..ce986ee 100644
--- a/src/cpp.c
+++ b/src/cpp.c
@@ -101,18 +101,6 @@ char const * cpp_get_filename(Cpp * cpp)
 }
 
 
-/* cpp_is_defined */
-int cpp_is_defined(Cpp * cpp, char const * name)
-{
-	size_t i;
-
-	for(i = 0; i < cpp->defines_cnt; i++)
-		if(strcmp(cpp->defines[i].name, name) == 0)
-			return 1;
-	return 0;
-}
-
-
 /* useful */
 /* cpp_define_add */
 int cpp_define_add(Cpp * cpp, char const * name, char const * value)
diff --git a/src/scanner.c b/src/scanner.c
index e606247..5e137f0 100644
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -187,7 +187,7 @@ static int _scan_ifdef(Cpp * cpp, Token ** token)
 
 	DEBUG_SCOPE();
 	name = token_get_data(*token);
-	take = cpp_is_defined(cpp, name);
+	take = (cpp_define_get(cpp, name) != NULL) ? 1 : 0;
 	token_set_data(*token, NULL);
 	free(name);
 	_cpp_scope_push(cpp, take ? CPP_SCOPE_TAKING : CPP_SCOPE_NOTYET);
@@ -201,7 +201,7 @@ static int _scan_ifndef(Cpp * cpp, Token ** token)
 
 	DEBUG_SCOPE();
 	name = token_get_data(*token);
-	take = !cpp_is_defined(cpp, name);
+	take = (cpp_define_get(cpp, name) == NULL) ? 1 : 0;
 	token_set_data(*token, NULL);
 	free(name);
 	_cpp_scope_push(cpp, take ? CPP_SCOPE_TAKING : CPP_SCOPE_NOTYET);